arch/ia64/include/asm/sigcontext.h

   1 #ifndef _ASM_IA64_SIGCONTEXT_H
   2 #define _ASM_IA64_SIGCONTEXT_H
   3
   4 /*
   5  * Copyright (C) 1998, 1999, 2001 Hewlett-Packard Co
   6  * Copyright (C) 1998, 1999, 2001 David Mosberger-Tang <davidm@hpl.hp.com>
   7  */
   8
   9 #include <asm/fpu.h>
  10
  11 #define IA64_SC_FLAG_ONSTACK_BIT                0       /* is handler running on signal stack? */
  12 #define IA64_SC_FLAG_IN_SYSCALL_BIT             1       /* did signal interrupt a syscall? */
  13 #define IA64_SC_FLAG_FPH_VALID_BIT              2       /* is state in f[32]-f[127] valid? */
  14
  15 #define IA64_SC_FLAG_ONSTACK            (1 << IA64_SC_FLAG_ONSTACK_BIT)
  16 #define IA64_SC_FLAG_IN_SYSCALL         (1 << IA64_SC_FLAG_IN_SYSCALL_BIT)
  17 #define IA64_SC_FLAG_FPH_VALID          (1 << IA64_SC_FLAG_FPH_VALID_BIT)
  18
  19 # ifndef __ASSEMBLY__
  20
  21 /*
  22  * Note on handling of register backing store: sc_ar_bsp contains the address that would
  23  * be found in ar.bsp after executing a "cover" instruction the context in which the
  24  * signal was raised.  If signal delivery required switching to an alternate signal stack
  25  * (sc_rbs_base is not NULL), the "dirty" partition (as it would exist after executing the
  26  * imaginary "cover" instruction) is backed by the *alternate* signal stack, not the
  27  * original one.  In this case, sc_rbs_base contains the base address of the new register
  28  * backing store.  The number of registers in the dirty partition can be calculated as:
  29  *
  30  *   ndirty = ia64_rse_num_regs(sc_rbs_base, sc_rbs_base + (sc_loadrs >> 16))
  31  *
  32  */
  33
  34 struct sigcontext {
  35         unsigned long           sc_flags;       /* see manifest constants above */
  36         unsigned long           sc_nat;         /* bit i == 1 iff scratch reg gr[i] is a NaT */
  37         stack_t                 sc_stack;       /* previously active stack */
  38
  39         unsigned long           sc_ip;          /* instruction pointer */
  40         unsigned long           sc_cfm;         /* current frame marker */
  41         unsigned long           sc_um;          /* user mask bits */
  42         unsigned long           sc_ar_rsc;      /* register stack configuration register */
  43         unsigned long           sc_ar_bsp;      /* backing store pointer */
  44         unsigned long           sc_ar_rnat;     /* RSE NaT collection register */
  45         unsigned long           sc_ar_ccv;      /* compare and exchange compare value register */
  46         unsigned long           sc_ar_unat;     /* ar.unat of interrupted context */
  47         unsigned long           sc_ar_fpsr;     /* floating-point status register */
  48         unsigned long           sc_ar_pfs;      /* previous function state */
  49         unsigned long           sc_ar_lc;       /* loop count register */
  50         unsigned long           sc_pr;          /* predicate registers */
  51         unsigned long           sc_br[8];       /* branch registers */
  52         /* Note: sc_gr[0] is used as the "uc_link" member of ucontext_t */
  53         unsigned long           sc_gr[32];      /* general registers (static partition) */
  54         struct ia64_fpreg       sc_fr[128];     /* floating-point registers */
  55
  56         unsigned long           sc_rbs_base;    /* NULL or new base of sighandler's rbs */
  57         unsigned long           sc_loadrs;      /* see description above */
  58
  59         unsigned long           sc_ar25;        /* cmp8xchg16 uses this */
  60         unsigned long           sc_ar26;        /* rsvd for scratch use */
  61         unsigned long           sc_rsvd[12];    /* reserved for future use */
  62         /*
  63          * The mask must come last so we can increase _NSIG_WORDS
  64          * without breaking binary compatibility.
  65          */
  66         sigset_t                sc_mask;        /* signal mask to restore after handler returns */
  67 };
  68
  69 # endif /* __ASSEMBLY__ */
  70 #endif /* _ASM_IA64_SIGCONTEXT_H */